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I bought a new thermostat that needs the c wire. Old thermostat wasnt using the blue c and was stuffed back in the wall. Come to find out the blue c wire is not connected to the furnace. Trying to connect the blue c wire to my furnace. As you can see all the wires are connect except the blue c which is wrapped at the bottom of the picture.


Found solution. Just connected C blue wire to the T terminal on the old furnace.

  • The other hint is the AC wires connecting to Y and T
    – Stavr00
    Nov 21 '17 at 17:38

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